Table 2.

Factors contributing to untreated decayed teeth, by multiple logistic regression analysis

Independent variable		n1	n2	Proportion of participants with decayed teeth (%)	OR*	95%CI	p
n1: total number of participants for each item, n2: the number of participants who had untreated decyed teeth. *The model included age, equivalent household income, educational background, overtime hours per month, brushing 2 times or more per day, eating between meals, having a regular dental clinic, interpersonal relationships at work, and smoking habit. OR: Odds Ratio; 95%CI: 95% Confidence Interval.
Age
	25-34	94	18	19.1	1
	35-44	238	53	22.3	1.29	0.67-2.47	0.446
	45-54	391	75	19.2	1.08	0.58-2.02	0.816
	55-64	228	46	20.2	1.37	0.70-2.69	0.362
Equivalent household income
	Under 5 million yen	300	64	21.3	1
	5-7 million yen	308	61	19.8	0.98	0.64-1.50	0.934
	7 million yen and over	282	57	20.2	0.96	0.62-1.48	0.835
	Unknown	61	9	14.8
Educational background
	High school or junior college	139	37	26.6	1
	College or Master's degree	812	155	19.1	0.55	0.34-0.89	0.015
Overtime hours per month
	0	108	14	13.0	1
	Over 0 to 45	634	119	18.8	1.76	0.91-3.39	0.092
	Over 45 to 80	164	45	27.4	2.56	1.23-5.33	0.012
	Over 80	45	14	31.1	3.01	1.13-7.97	0.027
Brushing 2 times or more per day
	No	233	67	28.8	1
	Yes	718	125	17.4	0.58	0.40-0.84	0.004
Eating between meals
	No	515	92	17.9	1
	Yes	436	100	22.9	1.57	1.10-2.23	0.013
Having a regular dental clinic
	No	356	111	31.2	1
	Yes	595	81	13.6	0.33	0.23-0.47	<0.001
Interpersonal relationships at work
	Good	542	91	16.8	1
	Bad	409	101	24.7	1.42	1.00-2.01	0.048
Smoking habit
	No	663	114	17.2	1
	Yes	288	78	27.1	1.96	1.36-2.82	<0.001